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  • 1
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hybrid Rotary Friction Welding is a modified type of common rotary friction welding processes. Inthis welding method, parameters such as pressure, angular velocity and time of welding controltemperature, stress, strain and their variations which play an important rule in defining optimumprocess parameter combinations in order to improve the design and manufacturing of weldingmachines and quality of welded parts. Thermo-mechanical simulation of friction welding has beencarried out. It has been shown that simulation is an important tool for prediction of generated heatand strain at the weld interface and can be used for prediction of microstructure and evaluation ofquality of welds. For simulation of Hybrid Rotary Friction Welding a commercial finite elementprogram has been used and the effects of pressure on temperature and strain variations have beeninvestigated
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 397-402 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Semi- solid (SS) processing technologies provide the production of metal parts withhomogeneous, fine and globular – grained microstructure. This is one of the most successful andreliable methods to produce near net shape products exhibiting good mechanical properties.Production of feed stock with non-dendritic and spherical structure is the critical factors in semisolidforming. Among several processes to obtain a globular microstructure, the SIMA (straininduced melt activated) process is simple and advantageous with respect to equipment andeliminating the melting stage before reheating. In this research, Al (A356) has been used and inorder to induce strain, ECAP (equal channel angular pressing) method has been applied. ECAP is amethod in which a great strain is induced and severe plastic deformation without any changes incross section area occurs. To induce larger strain, ECAP process was carried out on annealedspecimens up to several passes in route A (no rotation of samples around linear axis between eachpass) and Bc (90◦ rotation of samples around linear axis between each pass), in ambient temperature.The reheating condition was optimized and the comparison between different routes and number ofpasses was investigated. The microstructure evolution of deformed and reheated Al (A356) wascharacterized by SEM (Scanning electron microscopy) and optical microscopy. In addition, therelation between the induced strain with size and shape of particles has been studied
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  • 3
    Publication Date: 2018-11-16
    Description: The CPUE, CPUA and biomass of Pomadasys kaakan was assessed in the waters of the province of Bushehr in 2011. The study area was divided into three areas (Northern, Central and Southern) and depth zones (10-20, 20-30 and 30-50 m).Stratified random sampling was used to collect the data. Samples were taken from 45 stations. The total length and total mean length were calculated to be 27-56 cm and 42.7±4.95 cm, respectively. The total biomass was estimated to be approximately 5943.55 tons. The total CPUE and CPUA were calculated as being 803.25 kg/h and 9269.05 kg/nm^2, respectively. The lowest mean CPUE was observed in the 20-30 m depth zone and was 8.82 kg/h and the highest mean CPUE was observed in the 10-20 m depth zone as 21.45 kg/h. The lowest and highest mean CPUA were calculated in the 20-30 m and 10-20 m depth zones as being 95.91 kg/nm^2 and 259.35 kg/nm^2 , respectively. Also, the central area of Bushehr showed the highest CPUA with an estimate of 8913.9 kg/nm^2. The results of this study demonstrated that the highest distribution and biomass of P. kaakan were concentrated in central areas and 30-50 m depth zones.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 4
    Publication Date: 2018-06-19
    Description: One of the most visible direct impacts of fishing is the capture of non-target species, known collectively as by-catch. By-catch includes species that are unwanted and discarded (discards) and species that are retained and sold (byproduct) (Stobutzki et al., 2003). Although tuna purse seine fisheries have been shown to be selective, leading to lower levels of by-catch than other fisheries (Alverson et al., 1994; Kelleher, 2005), several species can be incidentally caught and, in some cases, discarded at sea. These include vulnerable and sensitive species such as turtles, mammals, and sharks (Minami et al. 2007; Romanov, 2008b). Tuna purse seine fisheries probably apply the most intensive direct human impact on the tropical epipelagic ecosystems in all oceans. Because of the worldwide scale of purse seine fisheries, an assessment of their impact on associated and dependent species is essential (Romanov, 2002a).
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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